UNPRINCIPLED Meaning of UNPRINCIPLED in English un ‧ prin ‧ ci ‧ pled AC /ʌnˈprɪnsəp ə ld, ʌnˈprɪnsɪp ə ld/ BrE AmE adjective formal not caring whether what you do is morally right SYN unscrupulous Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012